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The two sets are $\"\"$ and $\"\"$ .

(a)

The set of ordered pairs is $\"\"$ .

The set of ordered pairs $\"\"$ is not a function from $\"\"$ to $\"\"$ , because

the element $\"\"$ of set $\"\"$ is paired with more than one element of set $\"\"$ , i.e, $\"\"$ and $\"\"$ .

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(b)

The set of ordered pairs is $\"\"$ .

The set of ordered pairs is $\"\"$ is a function from $\"\"$ to $\"\"$ , because

each element of set $\"\"$ is paired with exactly one element of set $\"\"$ .

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(c)

The set of ordered pairs is $\"\"$ .

The set of ordered pairs is $\"\"$ represents a function from $\"\"$ to $\"\"$ , because each element of set $\"\"$ is paired with exactly one element of set $\"\"$ .

Thus, the set of ordered pairs $\"\"$ does not represents a function from $\"\"$ to $\"\"$ .

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(d)

The set of ordered pairs is $\"\"$ .

The set of ordered pairs is $\"\"$ represents a function from $\"\"$ to $\"\"$ , because each element of set $\"\"$ is paired with exactly one element of set $\"\"$ .

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(a) Not a function.

(b) function.

(d) Function.